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                    12.2020-01-16-java基本语法
            
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                    5.2020-01-10-性能调优举例一
            
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                    6.2020-01-10-性能调优举例三
            
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                    9.2020-01-15-性能调优举例五
            
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                    3.2019-12-30-dubbo面试
            
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                    1.2020-01-12-实例介绍 JAVA 泛型基础
            
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                    1.2019-12-30-性能调优
            
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                    1.2020-01-16-netty入门
            
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                    1.2019-12-28-solr-7.6.0.tgz安装
            
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                    [spring]
            
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                    1.2020-01-12-SpringBoot属性读取方式介绍
            
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        <li class="chapter " data-level="2.13.2" data-path="../spring/2020-01-12-使用spring boot+mybatis plus快速入门.html">
            
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                    2.2020-01-12-使用spring boot+mybatis plus快速入门
            
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        <li class="chapter " data-level="2.13.3" data-path="../spring/2020-01-13-spring-initMethod-destoryMethod.html">
            
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                    3.2020-01-13-spring-initMethod-destoryMethod
            
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                    4.2020-01-13-spring循环依赖
            
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                    5.2020-01-13-spring源码随记
            
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        <li class="chapter " data-level="2.13.6" data-path="../spring/2020-01-13-自定义mini-spring.html">
            
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                    6.2020-01-13-自定义mini-spring
            
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                    [websocket]
            
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                    1.2019-12-30-webscoket-springboot通信
            
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                    [linux]
            
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                    1.2019-12-28-Linux常用命令和快捷键
            
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        <li class="chapter " data-level="2.15.2" data-path="../../linux/2019-12-28-从零到一环境安装.html">
            
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                    2.2019-12-28-从零到一环境安装
            
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        <li class="chapter " data-level="2.15.3" data-path="../../linux/2019-12-30-vi-常用命令.html">
            
                <a href="../../linux/2019-12-30-vi-常用命令.html">
            
                    
                    3.2019-12-30-vi-常用命令
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.4" data-path="../../linux/2019-12-31-awk命令.html">
            
                <a href="../../linux/2019-12-31-awk命令.html">
            
                    
                    4.2019-12-31-awk命令
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.5" data-path="../../linux/2019-12-31-cup信息分析.html">
            
                <a href="../../linux/2019-12-31-cup信息分析.html">
            
                    
                    5.2019-12-31-cup信息分析
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.6" data-path="../../linux/2019-12-31-shell编程.html">
            
                <a href="../../linux/2019-12-31-shell编程.html">
            
                    
                    6.2019-12-31-shell编程
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.7" data-path="../../linux/2019-12-31-top命令.html">
            
                <a href="../../linux/2019-12-31-top命令.html">
            
                    
                    7.2019-12-31-top命令
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.8" data-path="../../linux/2019-12-31-普通用户docker的问题.html">
            
                <a href="../../linux/2019-12-31-普通用户docker的问题.html">
            
                    
                    8.2019-12-31-普通用户docker的问题
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.9" data-path="../../linux/2020-01-01-centos7 安装kubernetes.html">
            
                <a href="../../linux/2020-01-01-centos7 安装kubernetes.html">
            
                    
                    9.2020-01-01-centos7 安装kubernetes
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.10" data-path="../../linux/2020-01-01-centos安装常用配置.html">
            
                <a href="../../linux/2020-01-01-centos安装常用配置.html">
            
                    
                    10.2020-01-01-centos安装常用配置
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.11" data-path="../../linux/2020-01-01-docker使用.html">
            
                <a href="../../linux/2020-01-01-docker使用.html">
            
                    
                    11.2020-01-01-docker使用
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.12" data-path="../../linux/2020-01-01-kubernetes使用.html">
            
                <a href="../../linux/2020-01-01-kubernetes使用.html">
            
                    
                    12.2020-01-01-kubernetes使用
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.13" data-path="../../linux/2020-05-12-PG有用的SQL.html">
            
                <a href="../../linux/2020-05-12-PG有用的SQL.html">
            
                    
                    13.2020-05-12-PG有用的SQL
            
                </a>
            

            
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        <li class="chapter " data-level="2.15.14" data-path="../../linux/2020-05-12-vim命令.html">
            
                <a href="../../linux/2020-05-12-vim命令.html">
            
                    
                    14.2020-05-12-vim命令
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.16" >
            
                <span>
            
                    
                    [automate]
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="2.16.1" data-path="../../linux/automate/2020-01-12-redis伪集群创建脚本.html">
            
                <a href="../../linux/automate/2020-01-12-redis伪集群创建脚本.html">
            
                    
                    1.2020-01-12-redis伪集群创建脚本
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.16.2" data-path="../../linux/automate/2020-01-12-tomcat集群创建脚本.html">
            
                <a href="../../linux/automate/2020-01-12-tomcat集群创建脚本.html">
            
                    
                    2.2020-01-12-tomcat集群创建脚本
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.16.3" data-path="../../linux/automate/2020-01-12-zookeeper自动化脚本.html">
            
                <a href="../../linux/automate/2020-01-12-zookeeper自动化脚本.html">
            
                    
                    3.2020-01-12-zookeeper自动化脚本
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.16.4" data-path="../../linux/automate/2020-01-12-其他自动化脚本.html">
            
                <a href="../../linux/automate/2020-01-12-其他自动化脚本.html">
            
                    
                    4.2020-01-12-其他自动化脚本
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.17" >
            
                <span>
            
                    
                    [MySQL]
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="2.17.1" data-path="../../MySQL/2019-12-31-mysql常用命令.html">
            
                <a href="../../MySQL/2019-12-31-mysql常用命令.html">
            
                    
                    1.2019-12-31-mysql常用命令
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.18" >
            
                <span>
            
                    
                    [nginx]
            
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        <li class="chapter " data-level="2.18.1" data-path="../../nginx/2019-12-29-Nginx-Keepalived高可用集群.html">
            
                <a href="../../nginx/2019-12-29-Nginx-Keepalived高可用集群.html">
            
                    
                    1.2019-12-29-Nginx-Keepalived高可用集群
            
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        <li class="chapter " data-level="2.18.2" data-path="../../nginx/2020-01-16-nginx参数详细说明.html">
            
                <a href="../../nginx/2020-01-16-nginx参数详细说明.html">
            
                    
                    2.2020-01-16-nginx参数详细说明
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.19" >
            
                <span>
            
                    
                    [other]
            
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        <li class="chapter " data-level="2.19.1" data-path="../../other/2019-12-28-知识小计.html">
            
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                    1.2019-12-28-知识小计
            
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        <li class="chapter " data-level="2.19.2" data-path="../../other/2020-01-04-科学上网.html">
            
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                    2.2020-01-04-科学上网
            
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        <li class="chapter " data-level="2.19.3" data-path="../../other/2020-05-13-正则表达式.html">
            
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                    3.2020-05-13-正则表达式
            
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        <li class="chapter " data-level="2.19.4" data-path="../../other/template.html">
            
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                    4.template
            
                </a>
            

            
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            </ul>
            
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        <li class="chapter " data-level="2.20" >
            
                <span>
            
                    
                    [PostgreSQL]
            
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        <li class="chapter " data-level="2.20.1" data-path="../../PostgreSQL/2019-12-28-PostgreSQL安装文档.html">
            
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                    1.2019-12-28-PostgreSQL安装文档
            
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        <li class="chapter " data-level="2.20.2" data-path="../../PostgreSQL/2019-12-28-Postgres学习笔记.html">
            
                <a href="../../PostgreSQL/2019-12-28-Postgres学习笔记.html">
            
                    
                    2.2019-12-28-Postgres学习笔记
            
                </a>
            

            
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        <li class="chapter " data-level="2.20.3" data-path="../../PostgreSQL/2019-12-28-脚本MYSQL导出数据到PG.html">
            
                <a href="../../PostgreSQL/2019-12-28-脚本MYSQL导出数据到PG.html">
            
                    
                    3.2019-12-28-脚本MYSQL导出数据到PG
            
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        <li class="chapter " data-level="2.20.4" data-path="../../PostgreSQL/2020-01-04-docker-PostgreSQL安装文档.html">
            
                <a href="../../PostgreSQL/2020-01-04-docker-PostgreSQL安装文档.html">
            
                    
                    4.2020-01-04-docker-PostgreSQL安装文档
            
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        <li class="chapter " data-level="2.20.5" data-path="../../PostgreSQL/2020-01-17-阿里云PG主从切换问题.html">
            
                <a href="../../PostgreSQL/2020-01-17-阿里云PG主从切换问题.html">
            
                    
                    5.2020-01-17-阿里云PG主从切换问题
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.21" >
            
                <span>
            
                    
                    [python]
            
                </span>
            

            
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        <li class="chapter " data-level="2.21.1" data-path="../../python/2019-12-28-pip-install指定国内源镜像.html">
            
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                    1.2019-12-28-pip-install指定国内源镜像
            
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        <li class="chapter " data-level="2.21.2" data-path="../../python/2019-12-30-python内置函数.html">
            
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                    2.2019-12-30-python内置函数
            
                </a>
            

            
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        <li class="chapter " data-level="2.21.3" data-path="../../python/2019-12-30-一图搞懂基本python语法 .html">
            
                <a href="../../python/2019-12-30-一图搞懂基本python语法 .html">
            
                    
                    3.2019-12-30-一图搞懂基本python语法 
            
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        <li class="chapter " data-level="2.22" >
            
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                    [redis]
            
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                    1.2019-12-28-redis5.0.3安装
            
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        <li class="chapter " data-level="2.22.2" data-path="../../redis/2019-12-28-redis5.0.3集群搭建.html">
            
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                    2.2019-12-28-redis5.0.3集群搭建
            
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            </ul>
            
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        <li class="chapter " data-level="2.23" >
            
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                    [tool]
            
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                    1.2019-12-28-idea高效使用技巧和快捷键
            
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        <li class="chapter " data-level="2.23.2" data-path="../../tool/2019-12-28-PlantUML画图脚本.html">
            
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                    2.2019-12-28-PlantUML画图脚本
            
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        <li class="chapter " data-level="2.23.3" data-path="../../tool/2019-12-30-vscode高效使用.html">
            
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                    3.2019-12-30-vscode高效使用
            
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                    [windows]
            
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                    1.2020-01-12-本地服务成为互联网服务
            
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                    2.2020-01-12-注册bat为windows服务
            
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                                <p>&#x5B9E;&#x4F8B;&#x4ECB;&#x7ECD; JAVA &#x6CDB;&#x578B;&#x57FA;&#x7840;</p>
<h2 id="&#x96C6;&#x5408;&#x5BB9;&#x5668;&#x4E2D;&#x7684;&#x5BF9;&#x8C61;">&#x96C6;&#x5408;&#x5BB9;&#x5668;&#x4E2D;&#x7684;&#x5BF9;&#x8C61;</h2>
<p>&#x5148;&#x770B;&#x4E0B;&#x9762;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF0C;<code>test1</code>&#x5B9E;&#x4F8B;&#x5316;&#x4E00;&#x4E2A;<code>List</code>&#x5BB9;&#x5668;&#x7684;&#x65F6;&#x5019;&#x6CA1;&#x6709;&#x6307;&#x5B9A;&#x6CDB;&#x578B;&#x53C2;&#x6570;&#xFF0C;&#x90A3;&#x4E48;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5F80;&#x8FD9;&#x4E2A;&#x5BB9;&#x5668;&#x91CC;&#x9762;&#x653E;&#x5165;&#x4EFB;&#x4F55;&#x7C7B;&#x578B;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x8FD9;&#x6837;&#x662F;&#x4E0D;&#x662F;&#x5F88;&#x723D;&#xFF1F;&#x4F46;&#x662F;&#x5F53;&#x6211;&#x4EEC;&#x4ECE;&#x5BB9;&#x5668;&#x4E2D;&#x53D6;&#x51FA;&#x5BB9;&#x5668;&#x4E2D;&#x7684;&#x5BF9;&#x8C61;&#x7684;&#x65F6;&#x5019;&#x6211;&#x4EEC;&#x5FC5;&#x987B;&#x5C0F;&#x5FC3;&#x7FFC;&#x7FFC;&#xFF0C;&#x56E0;&#x4E3A;&#x5BB9;&#x5668;&#x4E2D;&#x7684;&#x5BF9;&#x8C61;&#x5177;&#x6709;&#x8FD0;&#x884C;&#x65F6;&#x7684;&#x7C7B;&#x578B;&#x4FE1;&#x606F;&#xFF0C;&#x8FD9;&#x610F;&#x5473;&#x7740;&#x4F60;&#x4E0D;&#x80FD;&#x591F;&#x5C06;&#x4E00;&#x4E2A;&#x5E26;&#x6709;&#x8FD0;&#x884C;&#x65F6;&#x7C7B;&#x578B;&#x4FE1;&#x606F;&#x7684;&#x5BF9;&#x8C61;&#x8D4B;&#x503C;&#x7ED9;&#x53E6;&#x4E00;&#x4E2A;&#x7C7B;&#x578B;&#xFF0C;&#x5426;&#x5219;<code>ClassCastException</code>&#x3002;</p>
<pre><code class="lang-java"><span class="hljs-meta">@Test</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">test1</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> Exception </span>{
    List list = <span class="hljs-keyword">new</span> ArrayList();
    list.add(<span class="hljs-string">&quot;float.lu&quot;</span>);
    list.add(<span class="hljs-number">1</span>);

    String name = (String) list.get(<span class="hljs-number">0</span>);
    <span class="hljs-keyword">int</span> num = (Integer) list.get(<span class="hljs-number">1</span>);
    System.out.println(String.format(<span class="hljs-string">&quot;name[%s], num[%s]&quot;</span>, name, num));
}
<span class="hljs-meta">@Test</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x6CA1;&#x95EE;&#x9898;&#xFF0C;&#x53EF;&#x4EE5;&#x5F88;&#x597D;&#x5730;&#x7F16;&#x8BD1;&#x548C;&#x8FD0;&#x884C;&#x901A;&#x8FC7;&#xFF0C;&#x95EE;&#x9898;&#x662F;&#x6211;&#x5FC5;&#x987B;&#x8981;&#x4E8B;&#x5148;&#x5F88;&#x6E05;&#x695A;&#x5730;&#x77E5;&#x9053;&#x5BB9;&#x5668;&#x4E2D;&#x7684;&#x7D22;&#x5F15;&#x4E3A;<code>0</code>&#x7684;&#x5BF9;&#x8C61;&#x662F;&#x4EC0;&#x4E48;&#x7C7B;&#x578B;&#xFF0C;&#x7D22;&#x5F15;&#x4E3A;<code>1</code>&#x7684;&#x5BF9;&#x8C61;&#x662F;&#x4EC0;&#x4E48;&#x7C7B;&#x578B;&#xFF0C;&#x5F88;&#x663E;&#x7136;&#xFF0C;&#x8FD9;&#x5728;&#x5B9E;&#x9645;&#x5E94;&#x7528;&#x4E2D;&#x662F;&#x4E0D;&#x5207;&#x5B9E;&#x9645;&#x7684;&#xFF0C;&#x4E5F;&#x662F;&#x4E00;&#x79CD;&#x5F88;&#x4E0D;&#x9760;&#x8C31;&#x7684;&#x505A;&#x6CD5;&#xFF0C;&#x90A3;&#x4E48;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#x5982;&#x4F55;&#x89E3;&#x51B3;&#x5462;&#xFF1F;<strong>&#x6CDB;&#x578B;</strong>&#x3002;</p>
<h2 id="&#x5F15;&#x5165;&#x6CDB;&#x578B;">&#x5F15;&#x5165;&#x6CDB;&#x578B;</h2>
<p>&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x6211;&#x4EEC;&#x5F15;&#x5165;&#x6CDB;&#x578B;&#xFF0C;&#x4E0B;&#x9762;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#x4E0E;&#x4E0A;&#x9762;&#x4E0D;&#x540C;&#x7684;&#x662F;&#x6211;&#x4EEC;&#x5728;&#x5B9E;&#x4F8B;&#x5316;&#x5BB9;&#x5668;&#x7684;&#x65F6;&#x5019;&#x52A0;&#x4E86;<code>&lt;String&gt;</code>&#x8FD9;&#x4E2A;&#x4E1C;&#x897F;&#xFF0C;&#x8FD9;&#x4E2A;&#x4E1C;&#x897F;&#x7684;&#x5B66;&#x540D;&#x53EB;&#x505A;&#x6CDB;&#x578B;&#x53C2;&#x6570;&#xFF0C;&#x5C31;&#x50CF;&#x666E;&#x901A;&#x65B9;&#x6CD5;&#x5E26;&#x6709;&#x53C2;&#x6570;&#x4E00;&#x6837;&#xFF0C;<code>interface List&lt;E&gt;</code>&#x4E2D;&#x7684;E&#x4E3A;&#x5F62;&#x5F0F;&#x53C2;&#x6570;&#x3001;&#x800C;<code>String</code>&#x4E3A;&#x5B9E;&#x53C2;&#x3002;</p>
<pre><code class="lang-java"><span class="hljs-meta">@Test</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">test2</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> Exception </span>{
    List&lt;String&gt; list = <span class="hljs-keyword">new</span> ArrayList&lt;String&gt;();
    list.add(<span class="hljs-string">&quot;a&quot;</span>);
    list.add(<span class="hljs-number">1</span>)<span class="hljs-comment">//1</span>
}
</code></pre>
<p>&#x5F15;&#x5165;&#x6CDB;&#x578B;&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x89C4;&#x5B9A;&#x8FD9;&#x4E2A;&#x5BB9;&#x5668;&#x4E2D;&#x53EA;&#x80FD;&#x5B58;&#x653E;&#x7C7B;&#x578B;&#x4E3A;&#x5B57;&#x7B26;&#x4E32;&#x7C7B;&#x578B;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x597D;&#x7684;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x53EF;&#x4EE5;&#x8BC6;&#x522B;&#x6CDB;&#x578B;&#x5E76;&#x5E2E;&#x6211;&#x4EEC;&#x68C0;&#x67E5;&#x7F16;&#x8BD1;&#x9519;&#x8BEF;&#xFF0C;&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x4E2D;1&#x5904;&#x4F1A;&#x51FA;&#x73B0;&#x7F16;&#x8BD1;&#x9519;&#x8BEF;&#x3002;&#x6CE8;&#x610F;&#xFF1A;&#x6CDB;&#x578B;&#x4FE1;&#x606F;&#x4EC5;&#x4EC5;&#x5B58;&#x5728;&#x4E8E;&#x7F16;&#x8BD1;&#x671F;&#x95F4;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x6CDB;&#x578B;&#x4FE1;&#x606F;&#x6765;&#x5BF9;&#x4EE3;&#x7801;&#x662F;&#x5426;&#x5B58;&#x5728;&#x8FDD;&#x89C4;&#x884C;&#x4E3A;&#xFF08;&#x7F16;&#x8BD1;&#x9519;&#x8BEF;&#xFF09;&#x6765;&#x8FDB;&#x884C;&#x68C0;&#x67E5;&#xFF0C;&#x5F53;&#x7F16;&#x8BD1;&#x5668;&#x5C06;&#x4EE3;&#x7801;&#x7F16;&#x8BD1;&#x4E3A;&#x5B57;&#x8282;&#x7801;&#x4E4B;&#x540E;&#xFF0C;&#x6CDB;&#x578B;&#x4FE1;&#x606F;&#x5C06;&#x4E0D;&#x590D;&#x5B58;&#x5728;&#xFF0C;&#x7136;&#x800C;&#x5BF9;&#x8C61;&#x7684;&#x8FD0;&#x884C;&#x65F6;&#x4FE1;&#x606F;&#x4ECD;&#x7136;&#x662F;&#x6709;&#x7684;&#xFF0C;&#x8FD9;&#x5C31;&#x89E3;&#x91CA;&#x4E86;&#x4E3A;&#x4EC0;&#x4E48;&#x4F1A;&#x51FA;&#x73B0;<code>ClassCastException</code>&#x3002;</p>
<h2 id="&#x7279;&#x522B;&#x6CE8;&#x610F;">&#x7279;&#x522B;&#x6CE8;&#x610F;</h2>
<p>&#x6709;&#x4E86;&#x6CDB;&#x578B;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x8BA9;&#x4EE3;&#x7801;&#x5B89;&#x5168;&#x5730;&#x901A;&#x8FC7;&#x7F16;&#x8BD1;&#xFF0C;&#x5E76;&#x4E14;&#x6211;&#x4EEC;&#x8BA4;&#x4E3A;&#x4ED6;&#x662F;&#x5B89;&#x5168;&#x7684;&#x4E86;&#xFF0C;&#x563F;&#x563F;&#xFF0C;&#x662F;&#x5426;&#x5C31;&#x771F;&#x7684;&#x5B89;&#x5168;&#x4E86;&#x5462;&#xFF1F;&#x662F;&#x5426;&#x5C31;&#x80FD;&#x548C;<code>ClassCastException</code>&#x8BF4;&#x62DC;&#x62DC;&#x4E86;&#x5462;&#xFF1F;&#x7B54;&#x6848;&#x662F;&#xFF1A;<strong>NO</strong>&#x3002;&#x770B;&#x770B;&#x4E0B;&#x9762;&#x8FD9;&#x6BB5;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code class="lang-java"><span class="hljs-meta">@Test</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">test3</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> Exception </span>{
    List&lt;String&gt; list = <span class="hljs-keyword">new</span> ArrayList&lt;String&gt;();
    list.add(<span class="hljs-string">&quot;a&quot;</span>);
    list.add(<span class="hljs-string">&quot;b&quot;</span>);

    List _list = list;
    List&lt;Integer&gt; integerList = _list;
    <span class="hljs-keyword">for</span> (Integer item : integerList) {
        System.out.println(String.format(<span class="hljs-string">&quot;item[%s]&quot;</span>, item));
    }
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x8FD9;&#x6BB5;&#x4EE3;&#x7801;&#x7F16;&#x8BD1;&#x6CA1;&#x6709;&#x95EE;&#x9898;&#xFF0C;&#x6211;&#x4EEC;&#x6CA1;&#x6709;&#x76F4;&#x63A5;&#x5C06;&#x6CDB;&#x578B;&#x53C2;&#x6570;&#x4E3A;<code>String</code>&#x7684;&#x5BB9;&#x5668;&#x8D4B;&#x503C;&#x7ED9;&#x6CDB;&#x578B;&#x53C2;&#x6570;&#x4E3A;<code>Integer</code>&#x7684;&#x5BB9;&#x5668;&#xFF0C;&#x800C;&#x662F;&#x82B1;&#x4E86;&#x70B9;&#x70B9;&#x5C0F;&#x5FC3;&#x601D;&#xFF0C;&#x6211;&#x4EEC;&#x73B0;&#x5C06;<code>list</code>&#x8D4B;&#x503C;&#x7ED9;<code>_list</code>&#xFF0C;<code>_list</code>&#x751F;&#x547D;&#x4E3A;&#x53EF;&#x4EE5;&#x5B58;&#x50A8;&#x4EFB;&#x4F55;&#x7C7B;&#x578B;&#xFF0C;&#x4E5F;&#x5C31;&#x76F8;&#x5F53;&#x4E8E;&#x65E0;&#x7279;&#x5B9A;&#x7C7B;&#x578B;&#xFF0C;&#x800C;&#x540E;&#x6211;&#x4EEC;&#x53C8;&#x628A;<code>_list</code>&#x8D4B;&#x503C;&#x7ED9;<code>integerList</code>&#x5BB9;&#x5668;&#xFF0C;<code>integerList</code>&#x5BB9;&#x5668;&#x88AB;&#x58F0;&#x660E;&#x4E3A;&#x53EA;&#x80FD;&#x5B58;&#x50A8;&#x7C7B;&#x578B;&#x4E3A;<code>Integer</code>&#x7684;&#x5BF9;&#x8C61;&#x3002;&#x60B2;&#x50AC;&#x7684;&#x662F;&#x8FD9;&#x6BB5;&#x4EE3;&#x7801;&#x5728;&#x8FD0;&#x884C;&#x7684;&#x65F6;&#x5019;&#x62A5;&#x4E86;<code>ClassCastException</code>&#xFF0C;&#x5F88;&#x660E;&#x663E;&#xFF0C;&#x6211;&#x4EEC;&#x77E5;&#x9053;&#x5728;&#x8FED;&#x4EE3;<code>integerList</code>&#x5BB9;&#x5668;&#x4E2D;&#x7684;&#x5BF9;&#x8C61;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x8FD9;&#x4E9B;&#x5BF9;&#x8C61;&#x662F;&#x6709;&#x8FD0;&#x884C;&#x65F6;&#x7C7B;&#x578B;&#x4FE1;&#x606F;&#x7684;&#xFF0C;&#x5F53;&#x5E26;&#x6709;<code>String</code>&#x7C7B;&#x578B;&#x4FE1;&#x606F;&#x7684;&#x5BF9;&#x8C61;&#x8D4B;&#x503C;&#x7ED9;<code>Integer</code>&#x7684;&#x65F6;&#x5019;&#x663E;&#x7136;&#x5C31;&#x62A5;&#x9519;&#x4E86;&#x3002;&#x8FD9;&#x4E00;&#x5207;&#x770B;&#x8D77;&#x6765;&#x4F3C;&#x4E4E;&#x6CA1;&#x95EE;&#x9898;&#xFF0C;&#x7B26;&#x5408;&#x903B;&#x8F91;&#xFF0C;&#x4F46;&#x662F;&#x6709;&#x4E00;&#x4E2A;&#x95EE;&#x9898;&#x6211;&#x4EEC;&#x8FD8;&#x6CA1;&#x6709;&#x95EE;&#xFF1A;&#x4E3A;&#x4EC0;&#x4E48;&#x4F1A;&#x6CA1;&#x6709;&#x7F16;&#x8BD1;&#x9519;&#x8BEF;&#xFF1F;</p>
<h2 id="&#x6CDB;&#x578B;&#x672F;&#x8BED;">&#x6CDB;&#x578B;&#x672F;&#x8BED;</h2>
<p>&#x5728;&#x5B66;&#x4E60;&#x6570;&#x5B66;&#x7684;&#x65F6;&#x5019;&#x6211;&#x4EEC;&#x5F80;&#x5F80;&#x4F1A;&#x5BF9;&#x4E00;&#x4E2A;&#x8BC1;&#x660E;&#x9898;&#x8FDB;&#x884C;&#x8BBA;&#x8BC1;&#xFF0C;&#x800C;&#x8BBA;&#x8BC1;&#x4E4B;&#x524D;&#x6211;&#x4EEC;&#x624B;&#x4E0A;&#x5F80;&#x5F80;&#x4F1A;&#x6709;&#x4E00;&#x4E9B;&#x4E0D;&#x9700;&#x8981;&#x8BC1;&#x660E;&#x7684;&#x5DF2;&#x77E5;&#x5B9A;&#x7406;&#xFF0C;&#x4E0B;&#x9762;&#x8FD9;&#x4E9B;&#x201C;&#x5B9A;&#x7406;&#x201D;&#x5C06;&#x88AB;&#x7528;&#x6765;&#x76F4;&#x63A5;&#x56DE;&#x7B54;&#x4E0A;&#x4E00;&#x8282;&#x4E2D;&#x9057;&#x7559;&#x7684;&#x95EE;&#x9898;&#x3002;</p>
<p><code>List&lt;E&gt;</code>&#x88AB;&#x79F0;&#x4F5C;&#x6CDB;&#x578B;&#x7C7B;&#x578B;&#x3002;
<code>List&lt;E&gt;</code>&#x4E2D;&#x7684;E&#x88AB;&#x79F0;&#x4E3A;&#x7C7B;&#x578B;&#x53D8;&#x91CF;&#x6216;&#x7C7B;&#x578B;&#x53C2;&#x6570;&#x3002;
<code>List&lt;String&gt;</code>&#x88AB;&#x79F0;&#x4E3A;&#x53C2;&#x6570;&#x5316;&#x7C7B;&#x578B;&#x3002;
<code>List&lt;String&gt;</code>&#x4E2D;&#x7684;String&#x88AB;&#x79F0;&#x4E3A;&#x5B9E;&#x9645;&#x7C7B;&#x578B;&#x53C2;&#x6570;&#x3002;
<code>List&lt;E&gt;</code>&#x4E2D;&#x7684;<code>&lt;&gt;</code>&#x8BFB;&#x4F5C;typeof&#x3002;
<code>List</code>&#x88AB;&#x79F0;&#x4E3A;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x3002;
&#x53C2;&#x6570;&#x5316;&#x7C7B;&#x578B;&#x53EF;&#x4EE5;&#x5F15;&#x7528;&#x4E00;&#x4E2A;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x5BF9;&#x8C61;&#xFF0C;&#x7F16;&#x8BD1;&#x62A5;&#x544A;&#x8B66;&#x544A;&#x3002;
&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x53EF;&#x4EE5;&#x5F15;&#x7528;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x5316;&#x7C7B;&#x578B;&#x5BF9;&#x8C61;&#xFF0C;&#x7F16;&#x8BD1;&#x62A5;&#x544A;&#x8B66;&#x544A;&#x3002;
&#x7531;&#x4E0A;&#x53EF;&#x77E5;&#xFF0C;<code>List&lt;Integer&gt; integerList = _list;</code>&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x7F16;&#x8BD1;&#x3002;</p>
<h2 id="&#x603B;&#x7ED3;&#xFF1A;&#x770B;&#x6E05;&#x672C;&#x8D28;">&#x603B;&#x7ED3;&#xFF1A;&#x770B;&#x6E05;&#x672C;&#x8D28;</h2>
<p>&#x7ECF;&#x8FC7;&#x4E0A;&#x9762;&#x7684;&#x4E00;&#x4E9B;&#x5C0F;&#x6CE2;&#x6298;&#xFF0C;&#x6211;&#x4EEC;&#x4E86;&#x89E3;&#x4E00;&#x4E9B;&#x5173;&#x4E8E;&#x6CDB;&#x578B;&#x7684;&#x672C;&#x8D28;&#xFF1A;&#x6CDB;&#x578B;&#x662F;&#x7ED9;<code>javac</code>&#x7F16;&#x8BD1;&#x5668;&#x4F7F;&#x7528;&#x7684;&#xFF0C;<code>javac</code>&#x662F;<code>JAVA</code>&#x7684;&#x7F16;&#x8BD1;&#x5668;&#xFF0C;&#x800C;&#x6CDB;&#x578B;&#x53EF;&#x4EE5;&#x8BA9;&#x4EE3;&#x7801;&#x5728;&#x7F16;&#x8BD1;&#x671F;&#x95F4;&#x786E;&#x5B9A;&#x7C7B;&#x578B;&#x5B89;&#x5168;&#xFF0C;&#x6BD4;&#x5982;&#x6211;&#x4EEC;&#x544A;&#x8BC9;&#x7F16;&#x8BD1;&#x5668;&#x67D0;&#x4E2A;&#x5BB9;&#x5668;&#x53EA;&#x80FD;&#x5B58;&#x50A8;&#x67D0;&#x79CD;&#x7C7B;&#x578B;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x90A3;&#x4E48;&#x7F16;&#x8BD1;&#x5668;&#x4F1A;&#x4E3A;&#x6211;&#x4EEC;&#x597D;&#x597D;&#x5730;&#x68C0;&#x67E5;&#xFF0C;&#x786E;&#x4FDD;&#x7C7B;&#x578B;&#x5B89;&#x5168;&#xFF0C;&#x4F46;&#x662F;&#x5B89;&#x5168;&#x662F;&#x76F8;&#x5BF9;&#x7684;&#xFF0C;&#x53EA;&#x8981;&#x6211;&#x4EEC;&#x9003;&#x8FC7;&#x7F16;&#x8BD1;&#x5668;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x6709;&#x4E00;&#x767E;&#x79CD;&#x65B9;&#x6CD5;&#x8BA9;&#x4EE3;&#x7801;<code>ClassCastException</code>&#xFF08;&#x6BD4;&#x5982;&#x53CD;&#x5C04;&#xFF09;&#x3002;&#x540C;&#x65F6;&#x7F16;&#x8BD1;&#x4E4B;&#x540E;&#x53C2;&#x6570;&#x5316;&#x7C7B;&#x578B;&#x5728;&#x8FD0;&#x884C;&#x65F6;&#x6CA1;&#x6709;&#x4EFB;&#x4F55;&#x6CDB;&#x578B;&#x4FE1;&#x606F;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x4E3A;&#x4EC0;&#x4E48;List.class&#x548C;<code>List&lt;String&gt;.class</code>&#x662F;&#x540C;&#x4E00;&#x4E2A;&#x4E1C;&#x897F;&#x3002;&#x9664;&#x4E86;&#x53C2;&#x6570;&#x5316;&#x7C7B;&#x578B;&#x4E4B;&#x5916;&#xFF0C;&#x5BB9;&#x5668;&#x4E2D;&#x7684;&#x5BF9;&#x8C61;&#x5728;&#x8FD0;&#x884C;&#x7684;&#x65F6;&#x5019;&#x662F;&#x6709;&#x7C7B;&#x578B;&#x4FE1;&#x606F;&#x7684;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x4E3A;&#x4EC0;&#x4E48;&#x4F1A;<code>ClassCastExcetion</code>&#x3002;</p>

                                
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